Three-piece cans consist of a top lid, a bottom lid, and a body. Each component plays a vital role in ensuring overall quality. Below are the key process and quality requirements for can lids.
Quality Control Requirements for Can Lids
1. Correct Mold
Verify that the mold system is properly installed.
Ensure the gap between the upper and lower cutting edges is accurate.
Adjust the slider height as needed.
Remove any foreign objects from the mold area.
Confirm that the safety protection device is functioning correctly.
2. Outer Diameter of the Curl
Inspect the curl around the entire cap for any deformation.
Use a caliper or similar tool to measure dimensions at three or more points along the circumference.
3. Opening of the Lid Edge
Check the lid edge for deformation or uneven sizing.
Use a caliper or similar instrument to measure at three or more points along the circumference.
4. Height of the Hook Edge
Thoroughly examine the hook edge height for signs of deformation.
Measure dimensions at three or more points around the circumference using appropriate instruments.
5. Depth of the Counter-Sink
Measure the counter-sink depth at three or more points using a depth gauge.
6. Shoulder Bottom Dimensions
Inspect the shape and dimensions of all parts of the cap to ensure accuracy.
7. Height of the Bead
Use a depth gauge or other measurement tools to determine the bead height at three or more points around the circumference.
8. Flatness
Stack several caps and carefully inspect them for overall flatness and uniformity.
9. Fractures
Examine the entire cap for any sign of breakage or tearing.
10. Deformation
Look for any noticeable deformations.
Perform dimensional checks where necessary.
11. Wrinkles
Check for wrinkles on the cap surface, especially along the hook edge and the sealing plane.
12. Scratches
Inspect for scratches across the entire cap, noting their orientation and severity.
13. Hook Edge Damage
Look for any damage to the hook edge.
Confirm that cutouts are evenly spaced and that cut edges are smooth and even.
14. Count for 2-Inch Caps
Use a specialized caliper to verify the count of caps for every 2 inches.
